摘要：( ) During the charity walk, people have to walk country parks and hills and mountains. A. over, through B. through, on C. through, over D. in, on

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During the charity walk, people have to walk country parks and hills and mountains．

During the charity walk, people have to walk ________ country parks and ________ hills and mountains．

A．over, through

B．through, on

C．through, over

D．in, on

During the charity walk, people have to walk ________ country parks and ________ hills and mountains．